JP3955343B2 - Method for drilling root canal and instrument set for carrying out the method - Google Patents
Method for drilling root canal and instrument set for carrying out the method Download PDFInfo
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- A61C5/40—Implements for surgical treatment of the roots or nerves of the teeth; Nerve needles; Methods or instruments for medication of the roots
- A61C5/42—Files for root canals; Handgrips or guiding means therefor
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Description
【０００１】
【産業上の利用分野】
本発明は、器具セットを用いた歯根管の穴開け法において、前記器具セットを前記管内に連続的に通す方法及び器具セットに関する。
【０００２】
【従来の技術】
歯根管の穴開けは、歯根孔に達するまで歯根管にきわめて細い器具をはめ込むカテーテル法とよばれる第１工程を有する。この作業は、常に手作業で行なわれる。
【０００３】
歯根管の穴広げは、多くの作業を含むが、手作業で行なうこともまた機械駆動式器具を用いて行なうこともできる。この第２の工程のためには、二つの方法を用いることができる。第一の方法は、「セットバック」法と呼ばれ、管の中に直径が増大する一連の器具を通し、直径が大きくなるごとに穴開けの長さを減らしていくものである。この方式は、比較的長時間を要し、歯科医は、自分で行なった作業を観察することができない。第２の方法は、「クラウンダウン」法と呼ばれ、まず歯の冠状部分を開き、次に順次細くなる一連の器具を歯根部まで差し込むものである。
【０００４】
この方法を実施することのできる公知の器具セットは、多くの場合、低速で回転する（２５０ないし５００回転／分）ハンドピースに取り付けられ、ニッケル−チタン合金製であリ、これには三種類のものがある。
【０００５】
第一の種類は、短い刃の部分に細くて可橈性のあるネックの付いた一連の器具からなり、ネック自身は器具の機械駆動を確実に行なうための手持ち部品に固定されたスリーブに接続される。実効部分の直径は、算術級数的に０．０２５ｍｍづつ増大する。
【０００６】
第二の種類は、長さが１６ｍｍの実効部分で長さ１ミリごとに０．０４ｍｍの円錐性を示す器具で構成される。この実効部分の後には、器具をスリーブに接続するための円筒部分が直接続いている。実効尖端部の直径の増加率は、各段ごとに２９％である。
【０００７】
最後の種類は、実効長が１６ｍｍで円錐形包絡面の器具からなる。これらの器具は、端部がすべて同じ直径を有し、円錐性は各段ごとに０．０５ｍｍ増加する。
【０００８】
本発明の目的は、一つには、カテーテル法の段階後のための歯根管の新しい穴開け法を提供することであり、もう一つには、公知の方法よりさらに確実で効率的な該方法を実施することを可能にする新しい器具を提供することである。該新しい方法は、また、より迅速で、公知の方法の場合以上の器具を必要とはしない。
【０００９】
さらに、該方法を実施するために用いられる器具は、公知の器具では必ずしも可能でなかったより規則的で連続した壁面を示す穴開けを可能とするものである。
【００１１】
【課題を解決するための手段】
歯根管に穴を開けるための器具のセットであって、
各器具が、少なくともその実効部分を構成する長さの一部分に切断用のらせん状エッジを有する先細のロッドからなり、
該ロッドは、セットの全ての器具に対し、同じ直径の尖端と器具のハンドルに近い後部での開き角度が、器具の尖端に近い前部での開き角度より大きい円錐を有し、
セットの先器具は、これら先器具の後部の円錐性が、後続する器具になると増加するのに対し、尖端と後部の間にある前部は同一の円錐性を有し、
セットの後器具の前部円錐性は、後続する器具になると増加し、それに対し、セットの後器具の後部の円錐性は後続する器具になると減少する、ことを特徴とする器具のセットにより達成することができる。
【００１２】
第２図および第３図において、器具の円錐性の相異を分かりやすくするために、器具の直径は、長さに対して誇張して示してある。
【００１３】
第１図に示す器具は、断面が円形でニッケル−チタン合金製のロッド１を有し、該ロッドは、その後部が、器具の機械駆動を確実に行なうためのアングル控えに係合する構成のスリーブ２の中にはめ込まれている。
【００１４】
ロッド１は、Ｌで示す前部にエッジを有する２本のらせん状溝３を有する。該器具のＬ’で示す長さ約３ｍｍの端部は、Ｄ３で示される点で終わっており、Ｄ３は、該器具のこの点での直径をあらわすが、らせん状溝３のエッジは、この長さ部分では、該器具が切れないようにまた溝が該器具によって切り取られた歯根の組織の屑を除去する効果しかないように鈍くされている。エッジを有する溝の数は、２本より多くすることができる。
【００１５】
Ｄ３から６ｍｍの距離Ｌ”のところにある、すなわち該器具の尖端から９ｍｍの距離のところにある点Ｄ９からは、第２図の１ａで示す第一の器具からわかるように、器具の円錐性がわずかに増大している。
【００１６】
該器具は、この新しい円錐性を実効部分Ｌの終わりとなる点Ｄ１６まで続ける。
【００１７】
第２図のセットの１ｂで示す第２の器具は、Ｄ９とＤ１６の間にある部分の円錐性の開きの角度が器具１ａのそれより大きい点で第１の器具と異なっている。
【００１８】
第２図のセットの１ｃで示す第３の器具に関しても同様である。
【００１９】
これら器具の実効長の点Ｄ９から後部の円錐性の差は、第２図から明確にわかろう。第２図では、器具１ａの輪郭が器具１ｂの上に鎖線で示されており。器具１ｂの輪郭は、器具１ｃの上に示されている。
【００２０】
第２図は、また、器具１ａ、１ｂ、および１ｃの３本の器具は、それらの尖端と直径Ｄ９の点の間の前部では円錐性が同じであることを示している。
【００２１】
セットの１ｄで示す第４の器具に関しては、その直径Ｄ９から前の前部の円錐性が、器具１ｃのそれより増大している。この器具の後部の円錐性も、器具１ｃに比して増大しているが、その程度はわずかである。このことは、セットの１ｅで示す最後である第５の器具に関しても同様で、この器具の前部および後部の円錐性は、器具１ｃに比して増大している。
【００２２】
管内に歯根孔まできわめて細い器具をはめ込む穴開けの第一段階、いわゆるカテーテル法を手動で行なった歯科医は、この器具セットによって、次に、機械駆動されるセットの器具１ａないし１ｅを、器具１ａから始めて器具１ｅまで連続的に利用することができる。
【００２３】
このようにセットの異なる各器具を連続的に利用することによって、各器具を用いて、その鋭くない前端部によって頂端まで案内されながら歯根管の特定の部分を広げる漸進的な作業を行なうことができ、本来の管の自然な湾曲からずれたり外れたりするのを避けることができる。
【００２４】
最初に穴が開けられるのは、管の冠部分であり、それによって、歯根の破片の最適除去とその後の器具の最適作業条件が確保される。ちなみに、これによって、頂端が齲蝕している歯根組織による感染のリスクは、大幅に減少する。次に、はの中間部分に穴が開けられ、最後に頂端部分に穴が開けられる。
【００２５】
器具の尖端部は、その円錐性が３ｍｍの長さに対して例えば２％でエッジに鋭さがなく、そのため頂端部分の端部に無用に穴が開けられることはない。
【００２６】
本発明の穴開け法および該方法の実施を可能にする器具セットによって、管により広くしかもより規則的に穴を開けることができ、したがって、管に最適な閉塞条件を確保することができる。最後の器具１ｅを通すことによって、穴開けの仕上げが行なわれる。
【００２７】
このように穴の開けられた歯根管は、公知の器具、とくにいわゆるゲート型の器具が用いられた場合のように表面に添って「階段」を形成するようないかなる不連続部分も示さない。
【００２８】
以上説明し図示した例にあっては、セットの器具の円錐性が直径Ｄ９の高さの一点でしか異ならない。しかし、一より多い点で、例えば直径Ｄ９と器具の尖端から１３ｍｍのところにある直径Ｄ１３の高さのところで円錐性を異ならせることも可能である。
【００２９】
同様に、器具の円錐の開きの角度を連続的に変えることによって口広がりあるいはラッパ状の形状の器具を実施することも可能である。その場合には、その表面の母線は、図示して説明した例の場合のように折線で構成されるのではなく、器具の尖端でその中心軸に向かう曲線で構成されることになる。
【００３０】
実際には、器具の直径Ｄ９より前方にある前部の円錐性は、２％程度で、それより後方にある後部の円錐性は、４．５ないし６％程度ある。
【００３１】
セットの器具の数は、図示して説明した例の５個より多くすることも少なくすることもできる。
【図面の簡単な説明】
【図１】図１は、歯根管の穴開け用器具の立面図である。
【図２】図２は、器具セットに属する歯根管の穴開け用の５本の器具の輪郭を示す図である。
【図３】図３は、図２の５本の器具を重ね合わせた輪郭を示す図である。
【符号の説明】
１…ロッド、２…スリーブ、３…らせん状溝、Ｄ３，Ｄ９，Ｄ１３，Ｄ１６…直径。[0001]
[Industrial application fields]
The present invention relates to a method and a tool set for continuously passing the tool set through the tube in a method for drilling a root canal using the tool set.
[0002]
[Prior art]
Drilling the root canal has a first step called catheterization, in which a very thin device is fitted into the root canal until the root canal is reached. This operation is always performed manually.
[0003]
Root canal hole expansion involves a number of operations, but can also be performed manually or using a mechanically driven instrument. Two methods can be used for this second step. The first method, called the “setback” method, involves passing a series of instruments of increasing diameter through the tube and decreasing the length of the drill as the diameter increases. This method requires a relatively long time, and the dentist cannot observe the work performed by himself. The second method, referred to as the “crown down” method, is to first open the crown of the tooth and then insert a series of instruments that become progressively narrower down to the root.
[0004]
Known instrument sets capable of carrying out this method are often mounted on handpieces that rotate at low speeds (250-500 rev / min) and are made of nickel-titanium alloy, which includes three types There are things.
[0005]
The first type consists of a series of instruments with a narrow, flexible neck on a short blade and the neck itself is connected to a sleeve fixed to a hand-held part to ensure the mechanical drive of the instrument Is done. The effective portion diameter increases by 0.025 mm in arithmetic series.
[0006]
The second type consists of an instrument that exhibits an effective portion of 16 mm in length and exhibits a conicity of 0.04 mm for every 1 mm of length. This effective part is directly followed by a cylindrical part for connecting the instrument to the sleeve. The increase rate of the effective tip diameter is 29% for each step.
[0007]
The last type consists of a device with an effective length of 16 mm and a conical envelope. These instruments all have the same diameter at the ends and the conicity increases by 0.05 mm for each step.
[0008]
The object of the present invention is, in part, to provide a new method of drilling the root canal after the catheterization stage, and in another, it is more reliable and efficient than known methods. It is to provide a new instrument that makes it possible to carry out the method. The new method is also faster and requires less instrumentation than known methods.
[0009]
In addition, the instrument used to carry out the method allows for the drilling of more regular and continuous wall surfaces than was possible with known instruments.
[0011]
[Means for Solving the Problems]
A set of instruments for drilling holes in the root canal,
Each instrument consists of a tapered rod having a cutting helical edge at least part of the length constituting its effective part,
The rod has, for all instruments in the set, a cone having the same diameter tip and an opening angle at the rear near the instrument handle that is larger than an opening angle at the front near the instrument tip;
The leading instruments of the set increase the conicality of the rear part of these leading instruments when they become subsequent instruments, whereas the front part between the tip and the rear part has the same conicity,
Achieving a set of instruments characterized in that the anterior conicity of the rear instrument of the set increases when it becomes a subsequent instrument, whereas the conicity of the rear part of the instrument after the set decreases when it becomes a subsequent instrument. can do.
[0012]
In FIG. 2 and FIG. 3, the diameter of the instrument is exaggerated with respect to the length in order to make it easier to understand the difference in the conicity of the instrument.
[0013]
The instrument shown in FIG. 1 has a
[0014]
The
[0015]
From the point D9 at a distance L ″ of 6 mm from D3, ie at a distance of 9 mm from the tip of the instrument, as can be seen from the first instrument shown in FIG. Has increased slightly.
[0016]
The instrument continues this new conicity until point D16 where the effective part L ends.
[0017]
The second instrument, shown as 1b in the set of FIG. 2, differs from the first instrument in that the conical opening angle of the portion between D9 and D16 is greater than that of
[0018]
The same applies to the third instrument shown by 1c in the set of FIG.
[0019]
The difference in the conicity of the rear part from the point D9 of the effective length of these instruments will be clearly seen from FIG. In FIG. 2, the outline of the
[0020]
FIG. 2 also shows that the three
[0021]
For the fourth instrument, indicated by 1d in the set, the conicity of the front part from the diameter D9 is greater than that of the instrument 1c. The conicity of the rear part of this instrument is also increased compared to the instrument 1c, but to a lesser degree. The same is true for the fifth instrument, which is the last indicated by 1e of the set, and the conicity of the front and rear of this instrument is increased compared to instrument 1c.
[0022]
A dentist who has manually performed the first stage of drilling, in which a very thin instrument is inserted into the canal into the root canal, the so-called catheterization method, is then used by this instrument set to set the machine-driven set of
[0023]
In this way, by successively using different instruments, it is possible to use each instrument to perform a gradual work of expanding a specific portion of the root canal while being guided to the apex by its non-sharp front end. It is possible to avoid deviation or deviation from the natural curvature of the original tube.
[0024]
The first hole is drilled in the crown portion of the tube, thereby ensuring optimal removal of root debris and subsequent optimal working conditions of the appliance. By the way, this greatly reduces the risk of infection by root tissue caries on the apex. Next, a hole is drilled in the middle part and finally a hole is drilled in the top end part.
[0025]
The tip of the instrument has a conicality of 2% for a length of 3 mm, for example, and the edge is not sharp, so that the end of the top end is not unnecessarily perforated.
[0026]
With the drilling method of the present invention and the instrument set that allows the method to be performed, the tube can be drilled wider and more regularly, thus ensuring optimal blocking conditions for the tube. Finishing the drilling is performed by passing the
[0027]
The perforated root canal does not show any discontinuities that form a “step” along the surface as is the case with known devices, in particular so-called gated devices.
[0028]
In the example described and illustrated above, the conicity of the set of instruments differs only at one point with a height of diameter D9. However, it is also possible to vary the conicity at more than one point, for example at a height of diameter D9 and a diameter D13 which is 13 mm from the tip of the instrument.
[0029]
Similarly, it is also possible to implement a flared or trumpet shaped instrument by continuously changing the opening angle of the instrument cone. In that case, the generatrix of the surface is not composed of a broken line as in the case of the example illustrated and described, but is composed of a curve toward the central axis at the tip of the instrument.
[0030]
In practice, the front conicity ahead of the instrument diameter D9 is about 2% and the rear conicity behind it is about 4.5-6%.
[0031]
The number of instruments in the set can be more or less than five in the example illustrated and described.
[Brief description of the drawings]
FIG. 1 is an elevational view of a root canal drilling instrument.
FIG. 2 is a diagram showing the outline of five instruments for drilling a root canal belonging to an instrument set.
FIG. 3 is a diagram showing an outline obtained by superimposing the five instruments shown in FIG. 2;
[Explanation of symbols]
1 ... Rod, 2 ... Sleeve, 3 ... Spiral groove, D3, D9, D13, D16 ... Diameter.
Claims (4)
各器具(1aから1e）が、少なくともその実効部分を構成する長さの一部分に切断用のらせん状エッジを有する先細のロッド(1)からなり、
該ロッド(1)は、セットの全ての器具に対し、同じ直径の尖端と器具のハンドルに近い後部（D9-D16）での開き角度が、器具の尖端に近い前部での開き角度より大きい円錐を有し、
セットの先器具(1a,1b,1c)は、これら先器具（1a,1b,1c）の後部の円錐性が、後続する器具になると増加するのに対し、尖端と後部の間にある前部（D3-D9)は同一の円錐性を有し、
セットの後器具(1d,1e)の前部(D3-D9)円錐性は、後続する器具になると増加し、それに対し、セットの後器具(1d,1e)の後部(D9-D16)の円錐性は後続する器具になると減少する、ことを特徴とする器具のセット。A set of instruments for drilling holes in the root canal,
Each instrument (1a to 1e) consists of a tapered rod (1) having a cutting helical edge at least part of its length constituting its effective part,
The rod (1) has, for all instruments in the set, an opening angle at the tip (D9-D16) close to the tip of the same diameter and instrument handle greater than the opening angle at the front near the instrument tip Having a cone,
The tip of the set (1a, 1b, 1c) has a conical shape at the rear of these tips (1a, 1b, 1c) which increases with the subsequent device, whereas the front (D3-D9) have the same conicity,
The front (D3-D9) conicality of the rear appliance (1d, 1e) of the set increases when it becomes a subsequent appliance, whereas the rear (D 9 -D16) of the rear appliance (1d, 1e) of the set A set of instruments characterized in that conicity decreases with subsequent instruments.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH03603/95A CH691789A5 (en) | 1995-12-20 | 1995-12-20 | Instrument set for the boring of radicular dental canals. |
| CH3603/95 | 1995-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09253092A JPH09253092A (en) | 1997-09-30 |
| JP3955343B2 true JP3955343B2 (en) | 2007-08-08 |
Family
ID=4259551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17036596A Expired - Fee Related JP3955343B2 (en) | 1995-12-20 | 1996-06-28 | Method for drilling root canal and instrument set for carrying out the method |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5658145A (en) |
| EP (1) | EP0780099B1 (en) |
| JP (1) | JP3955343B2 (en) |
| CH (1) | CH691789A5 (en) |
| DE (1) | DE69621755T2 (en) |
Families Citing this family (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0773749A1 (en) * | 1995-01-17 | 1997-05-21 | William B. Johnson | An improved method of endodontic preparation of a root canal and a file set for use in the method |
| US6059572A (en) * | 1995-06-06 | 2000-05-09 | Ultradent Products, Inc. | Endodontic methods for the anatomical, sectional and progressive corono-apical preparation of root canals with three sets of dedicated instruments |
| US6379155B1 (en) | 1996-06-06 | 2002-04-30 | Ultradent Products, Inc. | Endodontic systems and methods for the anatomical, sectional and progressive corono-apical preparation of root canals with instruments utilizing stops |
| US6045362A (en) * | 1995-06-06 | 2000-04-04 | Ultradent Products, Inc. | Endodontic methods for progressively, sectionally and anatomically preparing root canals with specific instruments for each section having predetermined working lengths |
| US6042375A (en) * | 1995-06-06 | 2000-03-28 | Ultradent Products, Inc. | Endodontic systems for progressively, sectionally and anatomically preparing root canals with specific instruments for each section having predetermined working lengths |
| US6558163B2 (en) | 1995-06-06 | 2003-05-06 | Ultradent Products, Inc. | Endodontic systems and methods for preparing upper portions of root canals with increasingly rigid files |
| US6390819B2 (en) | 1995-06-06 | 2002-05-21 | Ultradent Products, Inc. | Endodontic systems and methods for the anatomical, sectional and progressive corono-apical preparation of root canals with dedicated stainless steel instruments and dedicated nickel/titanium instruments |
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| US5257934A (en) * | 1992-03-25 | 1993-11-02 | Giovanni Cossellu | Endodontic instrument for preparing the root canal |
| US5380200A (en) * | 1993-10-08 | 1995-01-10 | Quality Dental Products, Inc. | Endodontic instrument of predetermined flexibility |
| US5897316A (en) * | 1994-04-28 | 1999-04-27 | Buchanan; Leonard Stephen | Endodontic treatment system |
-
1995
- 1995-12-20 CH CH03603/95A patent/CH691789A5/en not_active IP Right Cessation
-
1996
- 1996-04-02 DE DE69621755T patent/DE69621755T2/en not_active Expired - Lifetime
- 1996-04-02 EP EP96105242A patent/EP0780099B1/en not_active Expired - Lifetime
- 1996-04-08 US US08/629,316 patent/US5658145A/en not_active Expired - Lifetime
- 1996-06-28 JP JP17036596A patent/JP3955343B2/en not_active Expired - Fee Related
Also Published As
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|---|---|
| EP0780099A2 (en) | 1997-06-25 |
| US5658145A (en) | 1997-08-19 |
| CH691789A5 (en) | 2001-10-31 |
| DE69621755T2 (en) | 2003-03-06 |
| JPH09253092A (en) | 1997-09-30 |
| EP0780099B1 (en) | 2002-06-12 |
| EP0780099A3 (en) | 1998-01-28 |
| DE69621755D1 (en) | 2002-07-18 |
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